Ventilation grill



FIG. 1 is a top plan view of a ventilation grill showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a ventilation grill, as shown and described. 